﴿ يَعْلَمُونَ ظَٰهِرًۭا مِّنَ ٱلْحَيَوٰةِ ٱلدُّنْيَا وَهُمْ عَنِ ٱلْءَاخِرَةِ هُمْ غَٰفِلُونَ ﴾

“they know but the outer surface of this world’s life, whereas of the ultimate things they are utterly un­aware.”

They know merely an outward aspect of the life of this world that is to say its various means of securing livelihood such as commerce agriculture construction and cultivation and so on; but they of the Hereafter they are oblivious this repetition of hum ‘they’ is for emphasis.